The problem with getting rid of 2G/3G means calls and SMS can't be received unless you have VoLTE capable smartphones but to my lack of knowledge, it looks like telcos are limiting what VoLTE smartphones are allowed on their network which is a bummer.

I have an Asus Zenfone 5z and someone have inquired from Asus why VoLTE is not available on Asus Zenfones but their reply was for us to check with telcos instead. So it seems that even if the smartphone manufacturer enables VoLTE but cannot detect the service due to telcos block, then that is a bit messed up.

Please enlighten me. Thanks.

Will 2G still be around ? Isn't it suppose to be 2G and 3G to go at the same time meaning the minimum will be 4G LTE and above only ?
This is what is causing the confusion. I know that it is not so simple hence wanting to know more because me getting the same answer from both smartphone manufacturer and telco is ask the other party if they have VoLTE . taichi back and forth.

I tested on 2 Zenfones, Zenfone 2 Laser and Zenfone 5z, on both YES 4G and UniFi/mobile@unifi and I don't have VoLTE but on a Samsung A71, UniFi have VoLTE !

My assumption is there is a device whitelist on telco side but I don't know why. If this is so, then MCMC should enforce a no device whitelist/blacklist to start with. This is why nothing is clear to me now but as long as 2G is around for call and sms, its still ok for now.

But I do like to know how to make YES 4G VoLTE works on the Zenfones because YES 4G is fully 4G and without VoLTE, calls and sms is not available.

I think one Indian telco company, not sure if it is JIO, made an VoLTE app for those smartphones without VoLTE ?!

This post has been edited by extercy: Jul 5 2021, 01:02 PM

that is correct that is why I used the word fully ... "fully 4G" .. maybe I should use some other word... solely 4G.

And while waiting for MCMC to enforce telcos to get rid of the white/blacklist, maybe there are other options for VoLTE to work.

This post has been edited by extercy: Jul 5 2021, 01:28 PM

I recall in the past where Pre-3G SIM can only work on basic phones and the same SIM will not work in 3G and 4G phones... this was in 2013.

Then when 4G LTE came, some have to upgrade the SIM again because the SIM had limited KB for something ?

I think it is safe to say if your current SIM does not have a triple SIM cut outs or have no nano SIM option, then it is not fully 4G LTE compatible ?